CHICO — A bomb squad robot retrieved a package from U.S. Rep. Wally Herger’s office at Philadelphia Square Monday after officials X-rayed it and couldn’t identify its contents.

A woman working alone in the office said the same man she recalled being involved in a confrontation at the office about a week ago walked in just after noon on Monday, said a couple of unintelligible words, then left the package on a counter.

Lt. Linda Dye said the package was transported to a safe location, where it would be further examined, and possibly exploded using a water cannon.

Police evacuated the Capitol Building, which houses the congressman’s office and several businesses. Occupants of surrounding buildings on Independence and Constitution drives were advised to evacuate as a precaution, and most of them did.

Police said they were allowed back in the buildings about 3:45 p.m.

The name of the man who left the package isn’t known. He is described as white, between 50 and 60 years old, with wavy white hair and unkempt facial hair. He was wearing a baseball cap on Monday.

“We’d like to talk to this gentlemen, but at this point we’re not sure a crime has even been committed,” Dye said Monday afternoon.